diff --git a/History.markdown b/History.markdown
index b4f7f078..2fb09c48 100644
--- a/History.markdown
+++ b/History.markdown
@@ -66,6 +66,7 @@
   * Fix comment typo in `lib/jekyll/frontmatter_defaults.rb` (#3322)
   * Move all `regenerate?` checking to `Regenerator` (#3326)
   * Factor out a `read_data_file` call to keep things clean (#3380)
+  * Proof the site with CircleCI. (#3427)
 
 ### Site Enhancements